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Sika Sikasil WS-290 FPS White Base 1.5 Gallon Pail
Sikasil WS-290 FPS is a field-pigmentable ultra low modulus silicone in a White Base 1.5 gallon pail for EIFS and curtain-wall joints. It holds +100% / -50% movement and reaches tack-free in approximately 50 minutes at 77 F.
- Field-pigmentable Class 100/50 ultra low modulus weatherseal
- Joint movement +100% / -50%
- Is tack-free in approximately 50 minutes at 77 F
$322.43
Sikasil WS-290 FPS
Sikasil WS-290 FPS is a field-pigmentable, one-component plus color pack, non-sag, ultra low modulus, neutral-cure silicone that meets ASTM C920 Type S, Grade NS, Class 100/50 for EIFS, curtain-wall, and nonstructural glazing weatherseals. This White Base 1.5 gallon pail (part 412148) holds +100% / -50% movement, reaches Shore A 12 with approximately 165 psi tensile and 1,000% elongation, and is tack-free in approximately 50 minutes at 77 F. Color packs are sold separately; the cured bead is non-staining on most porous substrates.
Key Features
- One-component plus color pack, non-sag ultra low modulus silicone
- Meets ASTM C920 Type S, Grade NS, Class 100/50
- Joint movement +100% / -50%
- Shore A 12 with approximately 165 psi tensile and 1,000% elongation
- Tack-free approximately 50 minutes at 77 F; tooling window approximately 30 minutes
- Holds non-staining results on most porous substrates with SWRI ASTM C719 validation
Applications
- Seals expansion and control joints in precast panels and metal curtain walls
- Weatherseal work for glass-to-glass butt joint glazing
- Nonstructural glazing beads including cap, toe, and heel beads
- Works with Exterior Insulation Finish Systems (EIFS)
Technical Specifications
| Property | Value |
|---|---|
| Manufacturer | Sika |
| Product | Sikasil WS-290 FPS |
| Part no. | 412148 |
| Unit | 1.5 gallon pail (color pack sold separately) |
| Color | White Base |
| Chemistry | Field-pigmentable neutral-cure silicone |
| Movement | +100% / -50% (ASTM C-719) |
| Shore A | 12 |
| Tensile / elongation | Approximately 165 psi / 1,000% |
| Tack-free | Approximately 50 minutes at 77 F |
| VOC | 29 g/L |
Product documents: Sikasil WS-290 FPS Product Data Sheet (PDF)
Frequently Asked Questions
What movement capability does Sikasil WS-290 FPS hold?
+100% extension / -50% compression under ASTM C-719, matching Class 100/50.
What tack-free time should crews plan for with Sikasil WS-290 FPS?
Tack-free time is approximately 50 minutes at 77 F and 50% R.H. Tooling window is approximately 30 minutes.
What joints suit Sikasil WS-290 FPS on the facade?
Precast and metal curtain-wall expansion joints, glass-to-glass butt weatherseals, nonstructural glazing beads, and EIFS perimeter joints.
What hardness and elongation does cured Sikasil WS-290 FPS reach?
Shore A 12 with approximately 165 psi tensile strength and 1,000% elongation at break.
What color pack setup does Sikasil WS-290 FPS White Base use?
Field pigmentable base mixes with silicone color packs sold separately. This page is the White Base only.
What size is the Sikasil WS-290 FPS pail on this page?
This page is the White Base 1.5 gallon pail, part 412148.
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